Abstract
MR. CAMPBELL SWINTON'S forecast in NATURE of March 3, p. 8, has been fully verified since he wrote. On Tuesday, March 1, the Marconi Co. kindly lent me one of their three-valve amplifiers working with an S. G. Brown loud-speaking telephone and wooden trumpet. Mr. F. Swann, of the Marconi Co., personally superintended the installation, and we succeeded without much difficulty in producing a sound which made ordinary printed matter “legible” to several blind pupils in a room. A reading demonstration from the amplified sound was given in the presence of Sir William Collins and Mr. C. P. MacCarthy.
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D'ALBE, E. Amplifying the Optophone. Nature 107, 43 (1921). https://doi.org/10.1038/107043b0
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DOI: https://doi.org/10.1038/107043b0
